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129th General Meeting of Korean Chemical Society & Exposition Surface Analytical Studies on Organic Materials using Laser and QIT-ToF-SIMS

Submission Date :
2 / 22 / 2022 , 18 : 07 : 14
Abstract Number :
Presenting Type:
Poster Presentation
Presenting Area :
Physical Chemistry
Authors :
Chang Min Choi
Center for Scientific Instrumentation, Korea Basic Science Institute, Korea
Assigned Code :
PHYS.P-187 Assigend Code Guideline
Presenting Time :
April 14 (THU) 11:00~13:00
Over the past few decades, time-of-flight secondary ion mass spectrometry (ToF-SIMS) with various cluster ion beam apparatuses has been used a powerful instrument for a surface analysis and chemical imaging. Especially the coupling ToF-SIMS with gas cluster ion beams (GCIBs) help us to observe secondary molecular ions from a sample surface for image analysis of biological samples including tissues and cells. Even though it has great advantages, simple ToF mass spectra often have a difficulty assigning a peak which might exist candidates having a similar mass. Recently, some ToF-SIMS developers have been trying to add tandem mass spectrometric function. Therefore, a quadrupole ion trap time-of-flight secondary ion mass spectrometer (QIT-ToF-SIMS) has been developing to resolve the aforementioned problem. Secondary ions are generated from a sample surface with 20 keV toluene ion projectile produced by a UV pulse. The sputtered ions are transferred to a QIT though an extraction electrode and a set of electrostatic lens. After ion accumulation in QIT, the stored waveform inverse Fourier transform (SWIFT) pulse are applied to the QIT for the selection of an interested molecular ion. A laser pulse is irradiated onto the selected secondary ion in the QIT for the photo-induced dissociation (PID). The PID-resulting ions are detected by ToF-MS. The electronic absorption probability is obtained by recording photodepletion of the secondary molecular ion as a function of the laser wavelength. In this study, different molecular ions with similar mass are separated by photodepletion spectra. This would help us eliminate candidates with a confusion come from a similar mass. And furthermore, we anticipate PID study for a secondary ion open a chance to see a surface in a new perspective.